Just to clarify, the example I gave of WeakMap usage breaking with proxies was just to illustrate how a type of private data currently in use alongside proxies can break the target object purely by accident. While I do think [[CallMethod]] would go a long way to ameliorating the problem, I still believe allowing private symbol keyed properties to have a special immunity to proxies is a useful tool. The advice would be: use private symbols for properties that hold sensitive state to prevent proxies from accidentally breaking instances of your classes.
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